This image shows the same forum, logged out. http://i.imgur.com/ynFEf.png
Notice the addition of extra pages to certain threads. (I've enclosed them in red rectangles, with green/yellow showing no change).

Very odd behaviour, unless the intent is to have the forums mislead to logged out viewer. In which case, I wonder why it is picking some threads and not others to add a few extra pages too...

^^
p.s. Despite the change in thread times, the images were taken within a few seconds of each other. The change is due to the forum not applying my local time when logged out.

When you are logged out, the forum uses "default" settings, which is set to a specific amount of posts to be displayed each page of a thread, in what type of order, etc

When you are logged in, you can either continue using default settings or alter them. You are seeing a difference because you most likely have your custom settings when logged in set to something other than default.

When you are logged out, the forum uses "default" settings, which is set to a specific amount of posts to be displayed each page of a thread, in what type of order, etc

When you are logged in, you can either continue using default settings or alter them. You are seeing a difference because you most likely have your custom settings when logged in set to something other than default.

This is correct. I like to have like, at least 50 posts on screen so I can read everything at once.